The NH-U9S chromax.black is a completely black version of Noctua's whisper-quiet, award-winning premium cooler NH-U9S. The recipe for success remains unchanged thanks to the same compact tower cooler with NF-A9 PWM fan: strong cooling performance, excellent quiet operation, and outstanding compatibility with memory, cases, and PCIe. The chromax.black version, with its black fan and black-coated heatsink, also combines these advantages with a sleek stealth design.